Apparatus for drawing patterns from flasks.



No. 67|,7o2. Patented Anf. 9, |901.

- J. G. JoHNsToN.

APPARATUS FUR DRAWING PATTERNS FROM FLASKS.

(Application filed Dec. 13, 1900.) (No Model.)

j( j@ z mmlmnlu UNITED STATES ATENT OFFICE.

JOSEPH G. JOHNSTON, OF DETROIT, MICHIGAN, ASSIGNOR TO THE AMERICAN CAR & FOUNDRY COMPANY, OE ST. LOUIS, MISSOURI.

APPARATUS FOR DRAWING PATTERNS FROM FLASKS.

SPECIFICATION forming part of Letters Patent No. 671,702, dated April 9, 1901.

Application tiled December 13, 1900. Serial No. 39,692. (No model.)

T @ZZ whom it may concern,.-

Be it known that I, JOSEPH G. JOHNSTON,

a citizen of the United States, residing at the cityof Detroit, in the county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Apparatus for Drawing Patterns from Flasks, of which the following is a full, clear, and exact description, such as will enable others skilled in the art 1o to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates to a new and useful apparatus Jfor drawing patterns from a iiask, and has for its object to provide a device of that character which is simply constructed, effective in its operation, and is particularly adapted for use in connection with my iinzo proved patterns `and flasks which form the subject-matter of applications filed by me of even date herewith and serially numbered 39,691 and 39,693. i

I attain the object to which I have above referred by the mechanism shown in the accompanying drawings, in whichi Figure l is a side elevational view of my im proved apparatus, partly in section, wherein the drag pattern and flask are in position preparatory to being unclamped and separated; and Fig. 2 is a similar View illustrating the pattern and tlask separated.

In the drawings, P represents a pit, in theY center of which is arranged a pneumatic, hy-

' 35 draulic, or other fluid-operated cylinder R.

The upper end of the piston-rodof this cylinder carries a plate or disk S, which being in the position shown iniFig. l is elevated and ready to receive the drag pattern and flask and their carried sand matrix, which are clamped together as they are received from a molding-machine or other device which has compressed them and their carried sand.

The object sought is to remove the pattern from the flask, allowing the latter to retain the sand matrix. Consequently it is desirable to have the Iiask, which I will designate as I, underneath the pattern K, whereby when the parts are separated the sand matrix will remain face up in its` liask. 5o

T represents a plurality of standards preferably arranged around and extending a suitable distance above the pit P and designed to arrest the downward movement of the pattern, as will hereinafter be explained.

When the pattern and liask are in the p0- sition shown in Fig. 1 upon the plate S of the cylinder, lugs los, formed on the pattern K, are directly above the standards T, and when the clamps which hold the pattern and liask 6o together are removed and pressure is released from beneath the piston in cylinder R the weight of the pattern and liask causes the same and the piston to descend,'the pattern traveling until the lugs 708 Contact with the standards T, which arrests further downward movement ofthe same, while the flask and its carried sand matrixcontinue to descend until the pistou has reached itslowermost position in the cylinder. The pattern can then be removed 7o from the standards and the flask taken from the plate S.

While I have shown-and described my invention asV being constructed in connection with the pit P and have specied and illustrated' the standards T, I do not wish to limit myself to these specific features, as it is obvious that any suitablestructure or frame could as Well be employed without in the least `departing from the nature and principle of 8o my invention.

Having thus described my invention, what I' claim, and desire to secure by Letters Patent, is-

In an apparat-us of the character described, the combination with a plurality of fixed supports, of a centrally-arranged cylinder, a piston in said cylinder, a rod attached to the piston, a plate or disk arranged on the upper end of the piston-rod, the stroke of said pis- 9o ton being such as to carry said plate or disk above the fixed supports, a flask and pattern arranged on the plate in its highest position, the pattern being uppermost, and projections on said pattern in line with the xed supports,'whereby, when the plate or disk descends fromv its elevated position, the ask passes the fixed4 supports, and the projections on the pattern engage said fixed supports and arrest the downward movement of the pattern,'causin,q a separation therebetween and the descending 'fiaskg substantialiy as descri bed.

In testimony whereof I hereunto afx my signature, in the presence of two Witnesses, this 4th day of December, 1900.

JOSEPH G. JOHNSTON.

Witnesses:

DAVID W. HAWKSWORTH, JOHN STEVENSON, Jr. 

